Sorry mjp, i did not understand you. How you will understand what is going on to the catridge if you have a led?
Well, your cartridge wick runs dry. You pop it off to refill it with your syringe/dropper. You can switch on a little flashlight LED(it has nothing to do with the atomizer circuit) to help you see, in low-light conditions, the refilling process, so you don't under/overfill it. This is only usefull in low light when you can't see, at night or something. Just the fact that your vaporizer doubles as a mini-flashlight if you happened to need one. Does that make sense? Just an idea.
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